Very typical for Berlin are also the two tone brick buildings from that time. We still have a few of those around.
The primary school I went to had a similar fassade as the one you built and there are quite a few similar ones left.
For instance, this is what the police station looks like in the district I grew up:

As for the hex pattern Fallout hobbies carries vinyl stencils for that.
http://www.fallouthobbies.com/stencils/
Also saw a video on youtube about hex camo that was quite explanatory and interesting. Just search for hex camo on youtube and I bet you'll find it.